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Vesta Collisional History Revealed by Dawn: Building a Vesta Global Crater Catalog

Marchi, S. and McSween, H.Y. and O'Brien, D. and Schenk, P. and de Sanctis, M.C. and Gaskell, R. and Hiesinger, H. and Jaumann, R. and Mottola, S. and Preusker, Frank and Raymond, C.A. and Roatsch, T. and Russell, C.T. and Yingst, R.A. (2012) Vesta Collisional History Revealed by Dawn: Building a Vesta Global Crater Catalog. In: 43rd Lunar and Planetary Science Conference Abstracts. 43rd Lunar and Planetary Science Conference, 19.–23. März, 2012, The Woodlands, Texas, USA.

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Abstract

Introduction: Vesta is a 530 km diameter differentiated rocky body in the main asteroid belt that accreted within the first few million years after the formation of the earliest solar system solids [1,2,3]. These circumstances, along with the fact that Vesta's surface is probably sampled in meteorite collections, make Vesta one of the best targets for studying the early evolution of the main belt. According to current dynamical models [4,5,6,7], Vesta early evolution took place in an environment where collisions with other asteroids were much more frequent than today. While these models can inform our interpretations of Vesta's history, detailed studies of its impact record are necessary to discriminate between these different models and determine to what extent its surface has been reworked by cratering. Dawn observations of Vesta confirm and extend the range of geologic and impact processes seen on smaller asteroids. One of the obvious features emerging from these observations is that the surface of Vesta is dominated at all scales by impact craters. The lack of many of the obliteration processes that may occur on larger bodies (e.g., erosion on Mars, Venus; lava emplacement on the Moon and Mercury) allows for greater preservation of craters on Vesta. Observed crater sizes range from the resolution limit (10s of m for the low-altitude mapping orbit) to the largest ~500- km impact basin at the south pole, called Rheasilvia. Craters excavate and expose layers of different materials, drive regolith formation, and induce mass-wasting. Here we present the first attempt to develop a global crater catalog for Vesta that can be used to assess some of the above mentioned processes.

Item URL in elib:https://elib.dlr.de/79814/
Document Type:Conference or Workshop Item (UNSPECIFIED)
Title:Vesta Collisional History Revealed by Dawn: Building a Vesta Global Crater Catalog
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Marchi, S.NASA Lunar Science Institute, Boulder, COUNSPECIFIED
McSween, H.Y.University of Tennessee, Knoxville, TNUNSPECIFIED
O'Brien, D.Planetary Science Institute, Tucson, AZ, USAUNSPECIFIED
Schenk, P.Lunar and Planetary Institute, Houston, TXUNSPECIFIED
de Sanctis, M.C.Istituto Nazionale d'Astrofisica,Rome, ItalyUNSPECIFIED
Gaskell, R.Planetary Science Institute, Tucson, AZ, USAUNSPECIFIED
Hiesinger, H.University of Muenster, GermanyUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Raymond, C.A.Jet Propulsion Laboratory, Caltech, Pasadena, CAUNSPECIFIED
Roatsch, T.thomas.roatsch (at) dlr.deUNSPECIFIED
Russell, C.T.University of California, Los Angeles, CAUNSPECIFIED
Yingst, R.A.Planetary Science Institute, Tucson, AZ, USAUNSPECIFIED
Date:2012
Journal or Publication Title:43rd Lunar and Planetary Science Conference Abstracts
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Collisional History of Vesta
Event Title:43rd Lunar and Planetary Science Conference
Event Location:The Woodlands, Texas, USA
Event Type:international Conference
Event Dates:19.–23. März, 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt DAWN
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Aydin, Zeynep
Deposited On:17 Dec 2012 11:02
Last Modified:31 Jul 2019 19:39

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